Leaders of the Gap Inc. and Levi Strauss & Co. on Monday joined the growing chorus of business leaders opposed to bills critics say will allow businesses to discriminate against members of the LGBT community based on religious beliefs.

Indiana Governor Mike Pence, a Republican, has been under fire since he signed such a bill Thursday. A similar bill in Arkansas is expected to reach the desk of Governor Asa Hutchinson, who has pledged his signature.

(Related: IN Gov. Mike Pence won't say whether discrimination against gays should be legal.)

Unlike other states where similar bills have been enacted, civil rights laws in neither state include sexual orientation or gender identity as protected classes.

“As Indiana, Arkansas, and states around the country enact and consider legislation that perpetuates discrimination, we're urging State Legislatures to stand up for equality by repealing and voting against these discriminatory laws,” Gap CEO Art Peck and Levi Strauss & Co President Chip Bergh said in a joint statement.

“These new laws and legislation, that allow people and businesses to deny service to people based on their sexual orientation, turn back the clock on equality and foster a culture of intolerance.”

“Discriminatory laws are unquestionably bad for business, but more importantly, they are fundamentally wrong. They must be stopped,” they added.

Other business leaders who have spoken out against such bills include Apple CEO Tim Cook and Salesforce CEO Marc Benioff. Customer review website Angie's List put on hold its plans to expand in Indiana.